[HWKMETRICS-185] Port over the empty payload filter and body intercep…

…tor.

api/metrics-api-jaxrs-1.1/src/main/java/org/hawkular/metrics/api/jaxrs/filter/EmptyPayloadFilter.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hawkular.metrics.api.jaxrs.filter;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.HttpMethod;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.ext.Provider;
+
+import org.jboss.resteasy.core.ResourceMethod;
+import org.jboss.resteasy.core.ServerResponse;
+import org.jboss.resteasy.spi.Failure;
+import org.jboss.resteasy.spi.HttpRequest;
+import org.jboss.resteasy.spi.interception.PreProcessInterceptor;
+
+/**
+ * Set the {@link org.hawkular.metrics.api.jaxrs.filter.EmptyPayloadFilter#EMPTY_PAYLOAD} context property to
+ * {@link Boolean#TRUE} if the request is a POST.
+ *
+ * @author Thomas Segismont
+ * @author Stefan Negrea
+ */
+@Provider
+public class EmptyPayloadFilter implements PreProcessInterceptor {
+    public static final String EMPTY_PAYLOAD = EmptyPayloadFilter.class.getName();
+
+    @Context
+    HttpServletRequest servletRequest;
+
+    @Override
+    public ServerResponse preProcess(HttpRequest request,
+            ResourceMethod resourceMethod) throws Failure,
+            WebApplicationException {
+
+        if (!HttpMethod.POST.equals(resourceMethod.getMethod())) {
+            return null;
+        }
+
+        servletRequest.getServletContext().setAttribute(EMPTY_PAYLOAD, Boolean.TRUE);
+        return null;
+    }
+}

api/metrics-api-jaxrs-1.1/src/main/java/org/hawkular/metrics/api/jaxrs/interceptor/EmptyPayloadException.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hawkular.metrics.api.jaxrs.interceptor;
+
+/**
+ * Thrown by {@link EmptyPayloadInterceptor} when POST request body is empty.
+ *
+ * @author Thomas Segismont
+ */
+public class EmptyPayloadException extends RuntimeException {
+}

api/metrics-api-jaxrs-1.1/src/main/java/org/hawkular/metrics/api/jaxrs/interceptor/EmptyPayloadInterceptor.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates
+ * and other contributors as indicated by the @author tags.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hawkular.metrics.api.jaxrs.interceptor;
+
+import static java.lang.Boolean.TRUE;
+import static org.hawkular.metrics.api.jaxrs.filter.EmptyPayloadFilter.EMPTY_PAYLOAD;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.ext.Provider;
+
+import org.jboss.resteasy.annotations.interception.ServerInterceptor;
+import org.jboss.resteasy.spi.interception.MessageBodyReaderContext;
+import org.jboss.resteasy.spi.interception.MessageBodyReaderInterceptor;
+
+/**
+ * Make sure body is present if the {@link org.hawkular.metrics.api.jaxrs.filter.EmptyPayloadFilter#EMPTY_PAYLOAD}
+ * context property is set to {@link Boolean#TRUE}.
+ *
+ * @author Thomas Segismont
+ * @author Stefan Negrea
+ * @see org.hawkular.metrics.api.jaxrs.filter.EmptyPayloadFilter
+ */
+@Provider
+@ServerInterceptor
+public class EmptyPayloadInterceptor implements MessageBodyReaderInterceptor {
+
+    @Override
+    public Object read(MessageBodyReaderContext context) throws IOException, WebApplicationException {
+        Object object = context.proceed();
+        if (context.getAttribute(EMPTY_PAYLOAD) != TRUE) {
+            return object;
+        }
+        if (object instanceof Collection) {
+            Collection collection = (Collection) object;
+            if (collection.isEmpty()) {
+                throw new EmptyPayloadException();
+            }
+        } else if (object instanceof Map) {
+            Map map = (Map) object;
+            if (map.isEmpty()) {
+                throw new EmptyPayloadException();
+            }
+        } else if (object == null) {
+            throw new EmptyPayloadException();
+        }
+        return object;
+    }
+}